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UNITED STATES ATE OFFICE,

ARTHUR MUTSCHELLER, on NEW YORK, n. Y.

mn'rrron SED AND No Drawing.

To all whom it may concern: 3

Be it known that I, ARTHUR MU'rsoHnL- LER, a citizen of the United States, residing; at Number 332 East Eighty-third street, in

the borough of Manhattan, city of New York, in the county and State of New York,

. have invented new and useful Improvements 'in Methods Used andMaterials Employed in the Manufacture of Xray or Rout en Plates, Films, or Papers, of which the ollowing is a specification. a

The invention relates to theprocess of nm parting to such plates, films or papers increased sensitiveness toward X-rays or Riintgen raysor cathode rays or any other rays of shorter wave-length than {visible This has hitherto been effected by rays.

means of fluorescenuor so-called intensifying screens placed in contact with the pellicle of the X-ray plate, filmor a 1 l a Instead of relying upon these intensifying screens, I incorporate mto the emulsion 09nstitutingthe pellicle a suitable substance or mizgture which is either pentadecylp-tolyl ketone, or acridin-hydrochlorid, or anthracene derivatives, such as dichlor-anthracene 2-7 disodium: sulfonate-iand dimethyl -anthracene soluble salts, or phenanthrene, similar derivatives,etc., or any other soluble or transparent substance or mixture which will not interreact chemically with the emulsion or film (pellicle) and which, when exposedto X-rays or Rontgen rays or cathode rays or the like, after incorporation, produces a chemically active fluorescence. a

It willbe noted that, as the product of the method above set forth, I have a sensitized photographic material containing a substance which will not react chemically with the sensitized material, but which on exposure of the sensitized material to rays of shorter wave length than the visible rays will produce a chemically active fluorescence.

The foregoing method obviates the necessity and cost of intensifying-screens and does away with their inherent disadvantages, such as their large grain, their imperfect contact with the plate, film or paper and their quality ofpicturing dust particles' and scratches usually present on such screens. Moreover, by the lncorporation of any substance or mixture above described,

the chemical action of the fluorescence is greatly lncreased owing to the closer contact of such substance or mixture wlth the nonrenn. PLATES, FILMS, on reruns.

particles of; the emulsion. The maximum rlpenmg process jwlilch has hitherto impairedthe fineness and keeping qualities of the emulsion is, therefore, rendered unnecessary.

Iclaimi a l l. Theprocess of increasing Specificationlot Letters Patent. a; P tented Sept.9, 1919. i Application filed August 23. m1ajsaaljm:46.923,

the sensitiveness of sensitized materials to rays of shorter wave length than the visible rays, which process consist in incorporating with such sensitized materials a soluble transparent substance, which, on exposure to such rays, will produce a chemically active fluorescence and which substance Wlll not react chemiwhich, on exposure to such rays, will produce a chemically active fluorescence and whlch substance will not react chemically vwith such sensitized materials.

3. The process of increasing the sensitiveness of sensltlzed materials to rays of shorter wave length than the visible rays, which process consists in incorporating with such sensitized materials a soluble substance which, on exposure to such rays, will produce a chemically active fluorescence and which substance will not react chemically with such sensitized material's.

' 4. The process of increasing the sensitiveness of sensitized materials to raysof shorter wave length than the visible rays, which process consists in incorporating with such sens1t1zed mater1als a substance which, on

exposure tosuchrays, will produce a chemically active fluorescence and which substance will not react chemically with such sensitized materials.

5. The product, herein described consist ing of a sensitized,photographic material containing a soluble transparent substance,

which will not react chemically with the sensitized material, but which onexposure to rays of shorter wave length than the visible rays, will produce a chemically active fluorescence.

' 6. The product, herein described consistingot a sensitized photographic material containing a soluble substance, which will not react chemically with the sensitized material, but which on exposure to rays of shorter taming a transparent substance, which will not react chemically with the sensitizedmaterial, butwhich on exposure to rays of shorter Wave length than the visible rays,

will produce a chemically active fluorescence.

8. The product herein describ'edfconsisting of a sensitized photographic material containing a substance which will not react chemically with the sensitized material, but which on exposure to rays of shorter wave -.length.than the visible rays, will produce a 15 chemically active fluorescence.

In testimony-whereof I have hereunto set my hand, in presence of two witnesses, on the eighth day of July, A. D. one thousand nine hundred fifteen. 1

ARTHUR MUTSCHELLER. Witnesses:

; CARL Rose,

" WILLIAM J OHANNING. 

